Since the function \(\operatorname{E}\lbrace Q\rbrace \)  does not possess a clear minimum, the approximation algorithm must, as in (4.4-1), be defined within a \(\wp \) -neighborhood of the global minimum. This means that the sequence \(\omega _n\)  is subject to restrictions. For such demands, the conditions of Ljung [1]} are given. Theorem 4 of [1]} shall be formulated for the case and notation considered here:
